Math problem 8th grade can't understand

Question

Ian is fishing from a small boat. A fish swimming at the same depth as the hook at the end of his fishing line is 5 meters away from the hook. If Ian is 10 meters away from the fish, how far below Ian is the hook? If necessary, round to the nearest tenth.

Answer 1

5√2

Why do you not let them draw it out as a triangle.

Answer 2

This situation defines a right triangle with a base of 5, a hypotenuse of 10, and an unknown height of h. Draw a picture showing where everything is, and you will be able to see this. Use Pythagoras' theorem to find h.

h = √(10² - 5²) = ?